X04 DictyosponoidjE. 



in the Dictyosponge colony of H. tuherosum upon the farm of Mr. Cotton. 

 The lai'ge example referred to was taken from the foundation wall of a 

 ruined mill in the village of Avoca. A single example Avith the characteristic 

 nodes of the species comes from the Jenks quarry, Bath, N. Y. 



Htdnoceras phymatodes, sp. nov. 



Plate vi, Pigs. 4, 5 ; Plate xxxvii, Fig. 3. 



Sponge distinguished from other species of this genus by its broadly 

 expanded form and small, abundant nodes. The basal portion of the 

 cup is anodate for some distance, and the eight prismatic faces are 

 clearly apparent though somewhat obscured, the nodes of the vertical rows 

 being connected by longitudinal ridges which are also clearly defined over their 

 summits. To^vards the base of the cup these nodes are in eight longi- 

 tudinal rows, but near the middle or toward the aperture this number 

 is increased by intercalation to nine, ten or eleven. The specimen 

 figured on Plate vi shows the introduction of a single vertical line of nodes 

 at the fourth horizontal row (counting the incipient row near the base), and 

 on the opposite side of the cup the abrupt appearance of two new lines in 

 the fifth horizontal row. The cup also shows faint evidence of an eighth sub- 

 apertui-al horizontal row. The specimen shown on Plate xxxvii has similar 

 irregularities in the number and appearance of the nodes. All of these nodes 

 are low, with rounded margins and surfaces sloping nearly equally in all 

 directions, the concavities between the members of each horizontal row being 

 nearly as deep as those between successive rows. The horizontal constrictions 

 are thus very shallow ; they are also closely approximate and distinctly 

 marked by the elevated edges of the vertical prismatic faces. 



Reticulum fine, the various series of spicular bands not being very dis- 

 tinctly defined. 



Dimensions. Specimens of this species are usually much compressed 

 laterally, probably, however, without much exaggeration of the actual rate of 

 expansion of the cup. The figured example has the following dimensions : 

 Length, 180 mm.; greatest width, 83 mm.; height of nodes, 5 to 8 mm.; dis- 

 tance between the horizontal rows of nodes, about 10 mm. A larger example 

 has somewhat stouter and less rapidly multiplying nodes. 



Localities. In the schistose Chemung sandstones near Bath, Steuben 

 county, N. Y. The species is rare at this })lace, and its occurrence can not 

 be given more precisely. A specimen of much smaller size but of similar 



